- Agree to avoid trying to become pregnant or causing someone to become pregnant. Agree not to donate sperm or participate in other fertilization procedures. If sexually active, agree to use [AS PER AMENDMENT 02/05/02: 1] effective method of birth control while taking the study medications and for at least 30 days after stopping the study medications. Women who are not able to give birth or whose male partner is sterile are not required to use birth control.